Izod-charpy testing apparatus



July 19, 1949. VA. SONNTAG 2,476,634

IZOD CHARPY TESTING APPARATUS Filed Oct. 26. 1945 Fig-'4 Patented July 19, 1 949 IZOD-CHARPY TESTING APPARATUS Alfred Sonntag, Greenwich, Conn., assignor, by

mesne assignments, to The Baldwin Locomotive Works, a corporation of Pennsylvania Application October 26, 1945, Serial No. 624,878

4 Claims. 1

This invention relates to Izod-Charpy type of impact testing of materials as is customarily employed in pendulum impact testing machines.

It is an object of my invention to provide improved means for supporting Izod-Charpy striking edges whereby they may be selectively changed in a convenient and accessible manner while at the same time insuring an extremely rugged support for each striking edge when rendered operative.

Other objects and advantages will be more apparent to those skilled in the art from the following description of the accompanying drawing in which:

Fig. 1 is a side elevation of my improved arrangement for supporting Izod-Charpy striking edges on the lower end of a swinging pendulum of an impact machine (not shown), the Izod striking edge and specimen being shown in their operating position;

Fig. 2 is a view similar to Fig. 1 but showing the Charpy edge and specimen in operative position;

Fig. 3 is a plan view of Fig. 1 looking upwardly at the bottom of the Izod striking edge but with all other parts removed; and

Fig. 4 is a view looking upwardly at the bottom of Fig. 2 and showing the Charpy striking edge but with all other parts removed.

In the drawing, the usual impact testing machine pendulum I has a weighted head 2 with a channel 3 in which an Izod specimen 4 or Charpy specimen 5 is adapted to be suitably supported in vices, all as well known to those skilled in the art, and hence further disclosure of such elements as well as the pendulum machine itself need not be described. In my improved striking edge arrangement I provide a disc 6 seated in a circular recess 1 located in the lower end of pendulum l. The disc 6 is anchored in position by a series of cap screws 8 preferably located around the forward part of the disc as shown in Figs. 3 and 4.

The disc serves as a common support for an Izod striking edge 9 and a Charpy striking edge Iii. The Izod striking edge as shown in Figs. 1 and 3 is preferably formed on a semi-circular boss I I, while the Charpy edge as shown in Figs. 2 and 4 is formed on a tapered boss l2. The two bosses are substantially in vertical alignment with each other thereby affording a very large cross-sectional area of metal to insure maximum strength, while at the same time being readily receivable within the hollow pendulum arm I which, if necessary, may be slightly recessed at l3 to provide clearance for the back edge of the bosses.

To select either one of the striking edges, it is only necessary to remove studs 8 from the four openings and then replace the disc in an inverted position whereupon the screws 8 are tightened to firmly hold the disc in position,

From this disclosure it is seen that I have provided an extremely simple structure as well as one that has a high degree of sturdiness, compactness and ease of selection of the desired striking edge. Other advantages and improved results will be apparent from the foregoing disclosure to those skilled in the art who will also understand that various changes may be made without departing from the spirit of the invention as set forth in the appended claims.

I claim:

1. An impact testing apparatus comprising, in combination, a movable hammer element having an underside for supporting a striking edge, a disc having a striking edge projecting from one side of said disc and the opposite side thereof being so arranged that it may be supported upwardly against said underside and bodily removed therefrom, and threaded elements extending into said disc and connected to said movable element for removably securing said disc in position.

2. As an article of manufacture, an impact testing striking device comprising a relatively flat supporting disc having openings for receiving threaded holding elements, and a striking edge extending substantially at right angles from one of the flat sides of said disc.

3. As an article of manufacture, an impact testing striking device comprising a relatively flat supporting disc, and a striking edge element extending substantially at right angles from one of the flat sides of said disc, said striking edge element being off-set substantially entirely to one side of the disc diameter while the striking edge of said element is substantially at the diameter.

4. An impact testing apparatus comprising, in combination, a removable hammer element having a normally horizontally extending underside for supporting a specimen striking edge, a member having horizontally extending opposite sides one of which is complementary to said underside and is adapted to be supported upwardly against the same and to be bodily removed downwardly therefrom to allow the member to be replaced, a striking edge extending downwardly from the side of said member opposite to the complementary side, normally vertically extending threaded elements disposed above a horizontal plane containing said specimen striking edge for removably securing said member to said hammer file of this patent:

UNITED STATES PATENTS element. Number Name Date ALFRED SQNNTAG. ,623 Hartline Jan. 30, 1923 5 2,248,931 Anania. July 15, 1941 REFERENCES CITED 2,359,044 MacBride Sept. 26, 194:4 The following references are of record in the 23983 Kanter et 1945 

